This is what Dave Carne wrote about the subject, elsewhere on this forum:

Which seems to contradict your first post. Now I am really confused! I was taught that the right side of a feather goes on the near side of the fly, Bennett shows just the opposite, Carne seems to agree. Radenich does both. Now what.

Strip off all the fibers up to the thinnest part of the stem. Tie in by the tip and wrap 3 or 4 times. Pull off the remaining fibers and tie off on the backside of the hook. If need be build up the "head" till it is even with the hackle fiber and be sure it is flat for a least 4 wraps. Strap on wing and you are on your way.

Thanks for posting this. I tried the folded mallard roof untill i was out of feathers. I will have to try the partial-maried technique when i get some more...Not exactly common in my neck of the woods. Luckily there is internet. This cyclic theme seems to be popping up here on Easter Day...

ted patlin showed me the folded mallard for a roof, works great. I do both, depend on how i'm feeling at the time. actually think patlins technique is easier. good quality bronze mallard is the key to doing this method. fibers seem much stronger holding together

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I use the folded method but I really have to hump the feather in order to shape the curve similar to the wing curve but i still seem to lose some of the hump as the BM still exerts downward force when tied in. I tried the method shown in the clip above but couldn't get the slips from opposite sides of the feather to marry together, they just didn't want to.

Use some saliva after you fold them. Good quality mallard is hard to come by.

Oh yes I always put a good dollop of that on, seems to help alot. Correct me if I'm wrong but are slips of feathers taken from opposite sides of the feather meant to marry up with each other along their top edges? or have I got it totally wrong........